/*

   Copyright 2001,2003  The Apache Software Foundation 

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */
package org.apache.batik.svggen.font.table;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.RandomAccessFile;

/**
 * @version $Id$
 * @author <a href="mailto:david@steadystate.co.uk">David Schweinsberg</a>
 */
public class HmtxTable implements Table {

    private byte[] buf = null;
    private int[] hMetrics = null;
    private short[] leftSideBearing = null;

    protected HmtxTable(DirectoryEntry de,RandomAccessFile raf) throws IOException {
        raf.seek(de.getOffset());
        buf = new byte[de.getLength()];
        raf.read(buf);
/*
        TableMaxp t_maxp = (TableMaxp) td.getEntryByTag(maxp).getTable();
        TableHhea t_hhea = (TableHhea) td.getEntryByTag(hhea).getTable();
        int lsbCount = t_maxp.getNumGlyphs() - t_hhea.getNumberOfHMetrics();
        hMetrics = new int[t_hhea.getNumberOfHMetrics()];
        for (int i = 0; i < t_hhea.getNumberOfHMetrics(); i++) {
            hMetrics[i] = raf.readInt();
        }
        if (lsbCount > 0) {
            leftSideBearing = new short[lsbCount];
            for (int i = 0; i < lsbCount; i++) {
                leftSideBearing[i] = raf.readShort();
            }
        }
*/
    }

    public void init(int numberOfHMetrics, int lsbCount) {
        if (buf == null) {
            return;
        }
        hMetrics = new int[numberOfHMetrics];
        ByteArrayInputStream bais = new ByteArrayInputStream(buf);
        for (int i = 0; i < numberOfHMetrics; i++) {
            hMetrics[i] = (bais.read()<<24 | bais.read()<<16 | 
                           bais.read()<< 8 | bais.read());
        }
        if (lsbCount > 0) {
            leftSideBearing = new short[lsbCount];
            for (int i = 0; i < lsbCount; i++) {
                leftSideBearing[i] = (short)(bais.read()<<8 | bais.read());
            }
        }
        buf = null;
    }

    public int getAdvanceWidth(int i) {
        if (hMetrics == null) {
            return 0;
        }
        if (i < hMetrics.length) {
            return hMetrics[i] >> 16;
        } else {
            return hMetrics[hMetrics.length - 1] >> 16;
        }
    }

    public short getLeftSideBearing(int i) {
        if (hMetrics == null) {
            return 0;
        }
        if (i < hMetrics.length) {
            return (short)(hMetrics[i] & 0xffff);
        } else {
            return leftSideBearing[i - hMetrics.length];
        }
    }

    public int getType() {
        return hmtx;
    }
}
